% This file was made with: LaTeXPiX  (Build 3618)
% Coded by: N.J.H.M. van Beurden
% Email: beurden@email.com
% Webpage: http://www.beurden.cjb.net
\setlength{\unitlength}{0.254mm}
\begin{picture}(355,220)(0,-230)
       \allinethickness{0.254mm}\put(210,-25){\ellipse{30}{30}} % Plain Solid Circle
       \put(195,-35){\makebox(30,20)[cc]{\shortstack{$t_1$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\put(130,-75){\ellipse{30}{30}} % Plain Solid Circle
       \put(115,-85){\makebox(30,20)[cc]{\shortstack{$t_2$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\put(290,-75){\ellipse{30}{30}} % Plain Solid Circle
       \put(275,-85){\makebox(30,20)[cc]{\shortstack{$t_3$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\put(260,-125){\ellipse{30}{30}} % Plain Solid Circle
       \put(245,-135){\makebox(30,20)[cc]{\shortstack{$t_4$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\put(230,-175){\ellipse{30}{30}} % Plain Solid Circle
       \put(215,-185){\makebox(30,20)[cc]{\shortstack{$t_5$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\put(70,-175){\ellipse{30}{30}} % Plain Solid Circle
       \put(55,-185){\makebox(30,20)[cc]{\shortstack{$t_3$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\put(100,-125){\ellipse{30}{30}} % Plain Solid Circle
       \put(85,-135){\makebox(30,20)[cc]{\shortstack{$t_4$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(145,-110)(165,-110)(165,-130)(145,-130)(145,-110) % Plain Solid Square
       \put(145,-130){\makebox(20,20)[cc]{\shortstack{$y_5$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\put(130,-175){\ellipse{30}{30}} % Plain Solid Circle
       \put(115,-185){\makebox(30,20)[cc]{\shortstack{$t_3$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(145,-210)(165,-210)(165,-230)(145,-230)(145,-210) % Plain Solid Square
       \put(145,-230){\makebox(20,20)[cc]{\shortstack{$y_4$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(110,-210)(130,-210)(130,-230)(110,-230)(110,-210) % Plain Solid Square
       \put(110,-230){\makebox(20,20)[cc]{\shortstack{$y_2$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(70,-210)(90,-210)(90,-230)(70,-230)(70,-210) % Plain Solid Square
       \put(70,-230){\makebox(20,20)[cc]{\shortstack{$y_3$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(35,-210)(55,-210)(55,-230)(35,-230)(35,-210) % Plain Solid Square
       \put(35,-230){\makebox(20,20)[cc]{\shortstack{$y_1$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(140,-85)(150,-110)\special{sh 1}\path(150,-110)(148,-107)(149,-107)(149,-107)(150,-110) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(140,-185)(150,-210)\special{sh 1}\path(150,-210)(148,-207)(149,-207)(149,-207)(150,-210) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(270,-135)(280,-160)\special{sh 1}\path(280,-160)(278,-157)(279,-157)(279,-157)(280,-160) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(300,-85)(310,-110)\special{sh 1}\path(310,-110)(308,-107)(309,-107)(309,-107)(310,-110) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(120,-85)(105,-110)\special{sh 1}\path(105,-110)(107,-108)(106,-107)(106,-107)(105,-110) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(90,-135)(75,-160)\special{sh 1}\path(75,-160)(77,-158)(76,-157)(76,-157)(75,-160) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(250,-135)(235,-160)\special{sh 1}\path(235,-160)(237,-158)(236,-157)(236,-157)(235,-160) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(280,-85)(265,-110)\special{sh 1}\path(265,-110)(267,-108)(266,-107)(266,-107)(265,-110) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(60,-185)(45,-210)\special{sh 1}\path(45,-210)(47,-208)(46,-207)(46,-207)(45,-210) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(75,-190)(80,-210)\special{sh 1}\path(80,-210)(79,-207)(79,-207)(80,-207)(80,-210) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(125,-190)(120,-210)\special{sh 1}\path(120,-210)(121,-207)(120,-207)(120,-207)(120,-210) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(205,-210)(225,-210)(225,-230)(205,-230)(205,-210) % Plain Solid Square
       \put(205,-230){\makebox(20,20)[cc]{\shortstack{$y_6$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(235,-210)(255,-210)(255,-230)(235,-230)(235,-210) % Plain Solid Square
       \put(235,-230){\makebox(20,20)[cc]{\shortstack{$y_7$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(235,-190)(245,-210)\special{sh 1}\path(245,-210)(242,-205)(243,-205)(244,-205)(245,-210) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(225,-190)(215,-210)\special{sh 1}\path(215,-210)(218,-205)(217,-205)(216,-205)(215,-210) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(200,-35)(145,-70)\special{sh 1}\path(145,-70)(148,-69)(147,-68)(147,-68)(145,-70) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(220,-35)(275,-70)\special{sh 1}\path(275,-70)(272,-69)(272,-68)(273,-68)(275,-70) % Plain Solid Arrow
       \allinethickness{0.254mm}\path(275,-160)(295,-160)(295,-180)(275,-180)(275,-160) % Plain Solid Square
       \put(275,-180){\makebox(20,20)[cc]{\shortstack{$y_8$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(305,-110)(325,-110)(325,-130)(305,-130)(305,-110) % Plain Solid Square
       \put(305,-130){\makebox(20,20)[cc]{\shortstack{$y_9$}}} % Plain FrameBoxed Text
       \allinethickness{0.254mm}\path(110,-135)(125,-160)\special{sh 1}\path(125,-160)(123,-158)(123,-157)(124,-157)(125,-160) % Plain Solid Arrow
       \put(240,-60){\makebox(115,20)[cc]{\shortstack{$\{y_6, y_7, y_8, y_9\}$}}} % Plain FrameBoxed Text
       \put(40,-60){\makebox(140,20)[cc]{\shortstack{$\{y_1, y_2, y_3, y_4, y_5\}$}}} % Plain FrameBoxed Text
       \put(0,-110){\makebox(115,20)[cc]{\shortstack{$\{y_1, y_2, y_3, y_4\}$}}} % Plain FrameBoxed Text
       \put(15,-160){\makebox(65,20)[cc]{\shortstack{$\{y_1, y_3\}$}}} % Plain FrameBoxed Text
       \put(115,-160){\makebox(65,20)[cc]{\shortstack{$\{y_2, y_4\}$}}} % Plain FrameBoxed Text
       \put(180,-160){\makebox(65,20)[cc]{\shortstack{$\{y_6, y_7\}$}}} % Plain FrameBoxed Text
       \put(175,-110){\makebox(95,20)[cc]{\shortstack{$\{y_6, y_7, y_8\}$}}} % Plain FrameBoxed Text
        % Set color to black again (default font color)
\end{picture}
